Apparatus for generating and superheating steam



M. FRISCH A 2,366,717

APPARATUS FOR GENERATING AND SUPERHEATING STEAM Jan. 9, 1945.

2 Sheets-Sheet 1 Filed Nov. 29, 1940 IINVENTOR ART/N fie/sch BY ATTORNEY,Wr k1 g v w r. m M T w i N 6 4 Z S: A, w y 7% x l 1 w. f v m 5 mw M.FRISCH' 2,366,717

APPARATUS FOR GENERATING AND SUPERHEATING STEAM Jan. 9, 1945.

2 Sheets-Sheet 2 Filed Nov. 29, 1940 I l/1x1 0.00.0JOOOQQQUQIIIQIQIIOQIAIOOOOOOOOOODOOOOOOOOOOOOOOO oooooooooooooooooooooooo. woooooooooooooooooooooooo n oooooooooooooooooooooooooo0000ooooooooooooooocoooooooooc coo00000000oooooooooooooooooo9oooooooooooooooooooooeoooooooo conooooooooooooooooooooouooooooooooooooooooooooooooooooooooo oooooodooooooocooo000000000 no000oooooooooooooooooooooo o 0ooooooooooooooooooooococoonDDIOOOOOOODOODOOOOOOODDDDDDOD @WWW ATTORNEY h thereof, and in which:

The inner boundary of the furnace I9 defined by verticalbafile walls 23and 24 which Patented Jan. 9, 1945 APPARATUS FOR GENERATING ANDSUPERHEATING STEAM r Martin Friscli; New York, N. Yg, assignor to Fo s-lter Wheeler Corporation, New York, N. Y a

corporation of New York Application November 29, 1940, Serial No.367,802 tonn (or; 122--478) I This'invention relates to :vaporgenerators and more particularly pertains to apparatus for gen eratingand superheating. steam.

The invention provides a multiple furnace superheating steam generatorof novel and compact arrangement with which superheat control at allloads on the generatoris obtained. 6

The features and advantages which characterizethe invention will beunderstood from the following description considered in connection withthe accompanying drawings forming a part Fig; 1. is a vertical sectionalview of asteam generator embodying the invention;

i Fig. 2 is a horizontal line 22 of Fig. 1; i p

Fig.3 isa horizontal sectional view taken on line 33of Fig. 1 a i a Fig.4is a horizontal sectional view takenon line 4-4 of Fig. 1, and l I Fig;5 is a horizontal sectional view taken on line55 ofFig. 1. Likecharacters of reference refer to the sanie parts throughout the severalviews.

. Referring to the drawings, the steam generator illustrated hasverticalrefractory sidewalls II 3, a front wall'not shown,-

and I2, a. rear wall. I and roof portions I4 and I5. Adjacent the roofportion I5is a steam and water drum I 6, and between the latter androofportion I4 is a flue gas outlet I'I. Within thewsettingmareitwo spacedfurnaces I8 and I9 which are disposed adjacent the sidewalls I I and I2; respectively. The inner boundary of the furnace I8 is defined byvertical bafilewalls20 and-2| which are'in vertical alignment with, butspaced from, eachother to provide a gas outlet 22 in the lower portionof the furnace.

is similarly also are spaced to provide a gas outlet lower. portion ofthe furnace; One or more fuel burners 26, which-are disposed in the roofportion I4 of the setting, fire the furnace I8, and one or 25111 themore similar burners g'Iadisposed in the roof portion I5 and operatedindependently of the burners 26, fire the;furnace '19. Each of theburners 26 and 21 may be individually controlled to fire at anyintensity fromzero to maximum. The side walls II and I2 areincline'dinwardly adjacent their lower ends to provide-hopper shaped bottoms foreach of the furnaces which discharge into suitable ash pits 28 and 29respectively. Extending between the upper drum parallelto the upperdrum, is. a vertical bank ofsteam generating tubes 3! which are swept bysectionaltview taken on I6 and a. lower drum 3!),

. gas outlet I'I through a vertical gas passage prothe gases flowingfrom the furnace I9 to the flue vided by bafiles 32 and 33. The baffle32 extends downwardly from the drum I6, parallel with the tubes 3|, to apoint adjacentthe furnace gas outlet 25, whereit is joined to the bafile23 by a horizontally inclined bafile 34. The baflle 33-extends upwardlyfrom 'a soot hopper 35 below the drum 30, to a point adjacent the upperends of the tubes3l. l

The inner surface of the sidewall II is lined with vertical Water walltubes 36 which extend across the roof portion l Hland are connected attheir upper ends to the drum Hi, the lower ends being alternatelyconnected to headers 31 and 38 which are supplied with circulating waterby suitable external downcomer connections, not shown. The inner surfaceof the side wallIZ is similarly which extend to the drum I6 from lowerheaders j I 6 43 and 44 which are connected intothe boiler circulation.Adjacent the gas outlet. 25, the tubes 42 are spread .apart t -provide apassage for the gases. rear wall 13' which is at the rear end of thefurnace I8 is lined withwater wall tubes 45, and the innersurface of thewall I3 at the rear of the furnace I9 is similarly lined by water walltubes 46. It willbe understoodthat those parts of the inner surfaces ofthe front wall, not shown, which are at the front ends of the furnacesare lined with similar water wall tubes. I

In the form shown; a combination, radiant and convection superheaterisutilized and is so arranged anddisposed that it is subject to the heatof the gases produced in one furnace only; In the superheater furnaceI8, the furnace side of the baffle walls 20 and- 2| are lined withvertical radiant heat superheater tubes 41 and 48, which are alternatelydisposed, and tangent to each other,'as shown in Fig. 3, and form acontinuous panel or section of radiant heat absorbing surface except atthe furnace gas outlet passage 22, where the tubes are spread apart andbent out- Wardly from the furnace as shown in Fig. 4. The tubes 41,which areconnected to the steam space of thedrum. IS in two spacedlongitudinal rows as shown in Fig. 5, conduct steam downwardly in onepass to a lower header from which the That part of the inner surfaceofthe ting and through which gases flow in one direction from the furnaceoutlet to the outlet of the setting, vapor generating surface in saidgas passage, means forming another gas passage in said space extendingbetween the outlet of another furnace and the gas outlet of the settingand through which gases flow in one direction from the other furnaceoutlet to the outlet of the setting, and a superheater having a partthereof disposed adjacent a wall of the other furnace and another partdisposed in said other gas passage.

4. Vapor generating apparatus comprising a setting, spaced furnaces inthe setting, means in the upper part of each furnace for firing thefurnace, each furnace having an outlet in the lower part of the furnacein communication with the space between the furnaces, the outlet of atsetting, a vapor and liquid drum in the setting, spaced furnaces in thesetting, vapor generating surface in each of the furnaces, means in theupper part of each furnace for firing the furnace, each furnace havingan outlet opening in the lower part of the furnace in communication withthe space between the furnaces, said firing means being arranged todirect the gases of combustion toward said outlets, the setting having agas outlet in the upper portion thereof in comface in said gas passage,means forming another least one furnace being in the side thereofadjacent said space, said firing means being arranged to direct thegases of combustion toward said outlets, the setting having a gas outletin the upper portion thereof in communication with said space, meansforming one gas passage in said space extending between the outletof'said one furnace and the gas outlet of the setting and through whichgases flow in one direction from the furnace outlet to the outlet of thesetting, a superheater, having a part thereof disposed in the onefurnace adjacent said side thereof and extending over the furnaceoutlet, the superheater having another part in said gaspassage, meansforming another gas passage in said space extending between the outletof another furnace and the gas outlet of the setting and through whichgases pass in one direction from the other furnace outlet to the outletof the setting, and

vapor generating surface in said gas passage. 5. Vapor generatingapparatus comprising a gas passage in said space extending between theoutlet opening of another furnace and the gas outlet of the setting andthrough which gases flow in an upward direction only from the otherfurnace outlet to the outlet of the setting, and a superheater havingtubular members connected to the vapor space of the drum, said tubularmembers extending vertically downwardly within the other furnaceadjacent a wall thereof to the lower part of the furnace and in spacedrelationship to each other, other tubular members connecting with thelower ends of the first tubular member and extending upwardly withinthe-furnace adjacent said wall thereof and intermediate the firsttubular members, said other tubular members connecting with tubularmembers disposed outside of said furnace and in the path of the gasesflowing from the furnace to the gas outlet for the setting in said othergas passage.

MARTIN FRISCH,

CERTIFICATE OF CORRECTION.

Patent No, 2,566,7 7. January 9, 9 5 1 MARTIN FRISCH.

, and that the said Letters Pat- Leslie Frazer Acting Commissioner ofPatents.

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